/Engine/Source/Runtime/Experimental/Chaos/Public/PhysicsProxy/SingleParticlePhysicsProxy.h
Returns the underlying physics thread particle. Note this should only be needed for internal book keeping type tasks. API may change, use GetPhysicsThreadAPI instead.
[FParticleHandle](API\Runtime\Chaos\PhysicsProxy\FSingleParticlePhysicsProxy\FParticleHandle) * GetHandle_LowLevel()